BILLET ROLLING METHOD Russian patent published in 2002 - IPC

FIELD: rolled stock production, possibly manufacture of square cross section billets in continuous semifinishing and section rolling mills. SUBSTANCE: method comprises steps of multiple reduction of rolled piece in alternating horizontal and vertical grooved rolls at normalized distribution of elongation values in passes. In pass before prefinal one rolled piece is reduced at elongation degree 1.2-1.4 to octahedron with rounded upper and lower faces and with curvature of rounded faces (270-300)1/m; in prefinal pass rolled piece is reduced with elongation degree (1.2-1.3) to hexahedron with rounded lateral faces and with curvature of rounded faces (260-290) 1/m. Final pass is realized at elongation degree 1.3-1.4. EFFECT: improved resistance of rolled pieces against bending, twisting, prevention of local supercooling of rolled piece. 1 dwg, 1 tbl, 3 ex